CTS Speakers

ETI 1974 08 p89 a5c590507322

Chicago Telephone Supply (CTS) originally built drivers for telephone network signaling and tone generation. By the late 1950s they expanded into loudspeakers, supplying the booming tube-amp market.  Their speakers, often marked with the EIA code “137,” were used extensively by Fender, Ampeg, and many other amplifier companies from the 1950s through the 1970s. Early CTS … Read more